Passive and potential forms should not be able to be combined

[peldas]

Description
In Japanese grammar it is not possible to combine the 未然形 of られる twice – for example instead of 食べられられる ❌ it would be correct to say 食べられることができる ⭕. Attached is a screenshot showing Yomitan attempting to deinflect a typoed verb as potential-passive which is impossible.

Browser version
126.0b9 (64 ビット)

Yomitan version
24.4.16.0

[StefanVukovic99]

This should be relatively easy to fix, and seems logical, but just to be sure, could you find any source that this form is impossible in all cases?

[Lyroxide]

食べられられる ❌

That is possible.

Source: https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1085025955 (Best Answer)