Fix not visible figure-caption in CKEditor

Thats odd, ive looked through the code base for 9.0.27 and also 9.0.29 and in both the figure-caption ruleset is as follows:

.figure-caption {
  color: #6c757d;
  font-size: 90%;
}

Which should be a grey unless im missing something obvious.

Is #fffff9 definitely coming from the Verbase theme?

Thanks, Bouvet, for reporitng!
and Aaron, for following up.

To be checked and follow up with a fix.

Is this in CKEditor 4 or CKEditor 5 ?

thank you for helping

CKEditor 4 V1.02 (Drupal core 9.5.11)