If you browse a subversion repository history and open a commit, some commit information are missing as illustrated below :

Here is what I can say :

• Phorge doesn't manage repository (it is only observing it)
• All my subversion repositories seems affected
• The issue is also here with older version of PHP (tested with 7.4)
• Git repositories are not affected
• Phorge is able to get commits date since it is able to indicate it on first screenshot

Let me know if you need any additional information.