PHP Deprecated Messages "Creation of dynamic property" in Error Log

[Beleggrodion]

It looks like that with php 8.3 following messages appear in the roundcube error log:

[16-Jan-2025 08:40:20 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$name is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 50
[16-Jan-2025 08:40:20 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$add_tb_flags is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 52
[16-Jan-2025 08:40:20 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$message_tb_labels is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 59
[16-Jan-2025 08:40:21 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$name is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 50
[16-Jan-2025 08:40:21 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$name is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 50
[16-Jan-2025 08:40:21 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$add_tb_flags is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 52
[16-Jan-2025 08:40:21 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$add_tb_flags is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 52
[16-Jan-2025 08:40:21 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$message_tb_labels is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 59
[16-Jan-2025 08:40:21 UTC] PHP Deprecated:  Creation of dynamic property thunderbird_labels::$message_tb_labels is deprecated in /data/www/mail.domain.ch/www/plugins/thunderbird_labels/thunderbird_labels.php on line 59

So this coul'd be a problem with newer php versions in the future