This is what I was dealing with for the past near two months:
https://github.com/openwrt/openwrt/issues/11942
https://forum.openwrt.org/t/unable-to-connect-to-outside-internet-with-dumb-ap-coniguration/147483

Timeline:
Jan 5: Obtain Linksys E8450, convert it to OpenWrt, run into connectivity issue
Jan 6 - Jan 14: Initial troubleshooting and notes, flash OpenWrt 22.03.0-rc1; this delays wireless network migration
Jan 14 - Jan 16: Initial look into source code
Jan 16: Find forum thread on OpenWrt forums
Jan 26 -29: Second look into source code and more testing finds this issue was actually introduced in 22.03.0-rc2
Feb 5: Issue filed
Feb 20: workaround introduced by xNUTx
Feb 23: someone runs into same issue on OPNsense LAN bridge
Feb 26: xNUTx realizes they were on bridged LAN (accidental confirmation)
Feb 27: Third look into source code finds suspect commit
Feb 27 - Feb 28: Removing suspect commit fixes issue
Mar 1: Fully migrated to new setup running patched 22.03.3