Manage Lineup no longer working for TVE sources?

Just updated from v2021.09.14.2014 to v2021.09.17.2117
When I click Manage Lineup, or the # channels link for a TVE source, nothing happens. Nothing in the Console or Network Inspector.
Works for Pluto and HDHR sources.
Was this disabled on purpose?

Weird, now it's working after selecting Rescan Channels and exiting.

I have found that certain rescan/reload operations cause "Manage Lineup" to stop working for a few minutes with no indication that something is happening. It always comes back within 5 minutes.

I've noticed this too, that after running "Rescan All Channels" or "Rescan New Channels" on a TVE source, the "Manage Lineup" modal window won't open.

As a workaround, reloading the web page makes it work again right away.

Regardless, it's a confusing behavior to deal with, especially when you're likely already troubleshooting.

I'm pretty sure it was something in the update that took a couple minutes refreshing metadata for everything in /dvr/groups (according to my DVR logs) that caused the issue.