Can confirm that this also happens on iOS (iPad Air, iOS 12.4, Bedrock v1.14.20).
Only experienced this a few times though, especially when playing in servers (bought the game today - as of the time I'm writing this comment).
UPDATE: The game sometimes crashes on startup. Other times it loads the Mojang logo, then a white screen. Could just be due to my device being really old though.
Is the device really old? The battery might degrade, which leads to some performance issues. I have a refurbished iPad Air (bought in 2016) and fps is terrible, even with all the settings tuned down.