I'm still not able to replicate this on PHP7.4 or PHP8 using a stock build of v8 and v7.7.5.

If it "works" some days and "doesn't work" others, it's something going on with your host... Are they flipping PHP versions or is someone changing configurations on you?

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
Do you need Forum Install or Upgrade Services?
Forums: A Gardeners Forum, Scouters World
UBB.threads: UBBWiki, UBB Styles, UBB.Sitemaps
Longtime Supporter & Resident Post-A-Holic
VNC Web Services: Code Modifications, Upgrades, Styling, Coding Services, Disaster Recovery, and more!