Strange issue with a media player automation

Configuration
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Edit : Well, I changed to the device to media_player.music_station … I remembered it had something to do with HEOS and that works 100% with volume changes to the amp so the solution I guess.

I have a very simple automation that switches source and sets the volume on my amp (uses the HEOS integration) - the source switches without issue but most of the time the amp doesn’t update volume. I’ve tried delays, setting the volume multiple times without success. I thought fine, it’s an amp and the HEOS integration has known issues, however, what works 100% of the time is if I set the volume via the Mini Media Player card slider so I don’t even think it’s the HEOS integration. That card seems to be updating the volume differently to how set_volume is setting the volume in the automation.

Using the action tab of the dev tools section produces the same effect of not changing the volume on the amp which rules out the automation(s) causing the problem but I made a clean automations.yaml with only this automation in it anyway.

My question: Is it possible to leverage how that card is changing volume and automating that?

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The mini media player card, likely all media player cards, uses the action volume_set or volume_up … so it should behave similarly as when you setup an action using automation. And you have to be more precise as to ‘updating differently’, provide the automation (properly formatted), explain what happens on the media_player when setting volume level after you used the card and when you used the automation.