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My Setup: Sonos Arc, Sub Gen.3, 2x Era 300 as rear surrounds; Media Player: Nvidia Shield Pro 2019 (playback through Plex)

I recently added the 2 Era 300 as rear surrounds and when I now play a Dolby Atmos TrueHD file the height channels don‘t work anymore (when I turn off the surrounds in the sonos app the height channel from the sonos arc is suddenly working again, so I can be sure that the problem is coming from the era 300s). I use the following 7.1.4 and the 5.1.2 files to test the height channel output (both remain silent on all height channels): 

https://download.dolby.com/us/en/test-tones/dolby-test-tones_7_1_4.mp4

https://download.dolby.com/us/en/test-tones/dolby-test-tones_5_1_2.mp4

I configured Trueplay and turning it on or off doesn't change the behavior of this issue as well as any other setting in the sonos app. When playing the testfile the app is showing that Dolby Atmos is playing.

I bought the era 300 that I have better atmos and not that it doesn't work at all…

Edit: My TV is an LG 75NANO866PA and the eARC is set to passthrough. Never had a problem with Atmos height channels on the Sonos Arc without the era 300s.

After reading the following Post: 

I could resolve my issue by simply removing the surrounds and adding them again. This bug should be fixed nevertheless because I don‘t think most people test their channels one by one and can therefore not identify this problem.

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