Accents do not appear c/ PHP

Question

I’m making a certificate system for an event and when words with accents are inserted, they leave. I am using Laravel and a library called Intervention Image to generate the images of the certificates and add texts to the spaces left in the image. After the image is generated, a PDF is created.

Follow the image of the certificate:

As shown in the figure, the accents are not being inserted.
Below is the code in which the texts are placed.

                    $img = Image::make(public_path().'/imagens/certificado.jpg');
                    //NOME
                    $img->text($usuario->name, 800, 320, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(60);
                        $font->align('center');
                        $font->color('#000000');
                    });

                    //CPF
                    $img->text($usuario->cpf, 310, 383, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(18);
                        $font->align('center');
                        $font->color('#000000');
                    });

                    //TIPO ATIVIDADE

                    $img->text('Organizacão', 640, 383, function($font) {
                        $font->file(public_path().'/font/Exo-Regular.otf');
                        $font->size(18);
                        $font->align('center');
                        $font->color('#000000');
                    });

                    //NOME ATIVIDADE
                    $img->text('Comissão organizadora', 1060, 383, function($font) {
                        $font->file(public_path().'/font/arial.otf');
                        $font->size(18);
                        $font->align('center');
                        $font->color('#000000');
                    });

                    //TIPO
                    $img->text('Organizador(a)', 670, 413, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(19);
                        $font->align('center');
                        $font->color('#000000');
                    });

                    //HORAS
                    $img->text('40', 945, 413, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(19);
                        $font->align('center');
                        $font->color('#000000');
                    });

                    //MINUTOS
                    $img->text('00', 1010, 413, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(19);
                        $font->align('center');
                        $font->color('#000000');
                    });


                    //AUTENTICIDADE
                    $img->text('A autenticidade desse certificado pode ser verificada pela URL:', 362, 1030, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(19);
                        $font->align('center');
                        $font->color('#ffffff');
                    });


                    $file = 'www.feiradascidades.canoas.ifrs.edu.br/validar/certificadocomissao'.$usuario->id;
                    //URL
                    $img->text($file, 392, 1050, function($font) {
                        $font->file(public_path().'/font/Asimov.otf');
                        $font->size(19);
                        $font->align('center');
                        $font->color('#ffffff');
                    });

                    $caminho[$key] = public_path().'/imagens/certificadocomissao'.$usuario->id.'.jpg';

                    $img->save(public_path().'/imagens/certificadocomissao'.$usuario->id.'.jpg');`

This generator was made via localhost on Windows, but is hosted on a Linux server. During development on Windows, the accents worked perfectly and after hosting not.

The header of all HTML files have the charset set set to UTF-8 and in the class that mount the image (code above), is being used the ini_set('default_charset', 'UTF-8');

When executing the following

ini_set('default_charset', 'UTF-8');
dd(ini_get('default_charset'));

as a result of

In fact the charset is set to UTF-8, but the words continue without accent. I tried numerous things to solve, but so far unsuccessful.

EDIT:
Looking further, the data arrive in UTF-8, verified by mb_check_encoding. Apparently, the problem is at the time of saving the image, because it is already saved with the problem of accents. I believe the problem is in this part:

$img->save(public_path().'/imagens/certificadocomissao'.$usuario->id.'.jpg');