Ann: MOZ - FY20 Results Release, page-17

I have a feeling the sell off was linked to people consuming the audit report which under the heading "material uncertainty regarding going concern" tells you BDO agree with the directors statements in note 1 which includes the phrase:

"these aforementioned events and conditions give rise to an existence of a material uncertainty which may cast significant doubt on the Groups ability to continue as a going concern".

DYOR - I suggest reading BDO's report and the entirety of the financial statements.