CE-NG Dolby Vision (+FEL) for DV-licensed SOCs (s905x2, s922x/z, s905x4)

Log snippets are useless, only full log will help:
https://wiki.coreelec.org/coreelec:ce_support

Only if profile 7, 8 or 10 what is including a HDR fallback.

EOTF & Gammut tells you current output mode.

It’s prefered to use CE-NO.
CE-NG is old and outdated and EOL.