I am experiencing the following.
My hot bar window at the bottom of the screen in MCPE disappears when using a crafting table or a furnace hence this renders the. I come out of the game and reload the save file again and the hot bar is there. I have also had this issue when using the crafting table, when exiting the crafting menu:
If you press on the three dots it makes the hotbar vanish
if you click the cross whilst in the crafting menu to does not dissappear
if i click on chat sometimes the crafting menu is shown. I'm playing in a Single player survival mode.
Linked issues
Comments

Oh well I'm sorry someone beat me to it can't do right for doing wrong
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-20783.
It has been linked to this report. If you have additional information, please add it to that report.
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