Download Minecraft PE 184.108.40.206 BETA for Android already here. Mojang fixed many bugs and added some features.
Download Minecraft PE 1.17.40 FULL version for Android. Mojang fixed many bugs and crashes. All fixes you can see below.
Download Minecraft PE 1.17.34 FULL version for Android you can in this article. Unfortunately Mojang didn't add any stuff such like mobs or blocks.