Software update makes HDR content “unwatchable” on Roku TVs

A few days ago my TCL Roku TV got an update that offered (enabled by default) a new "Smart Picture" feature that supposedly obviates the need to set the picture mode manually. That seems like something worth investigating here.

https://community.roku.com/t5/Features-settings-updates/Roku-Smart-Picture-how-where-to-ask-ROKU-to-let-us-turn-this-quot-feature-quot-off/td-p/980373