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The datetime field goes undefined after doc is submitted

I have recently upgraded frappe to frappe v13.0.0-beta.4 (version-13-beta).
After this upgrade its noticed that the doctypes which has fields related to ‘datetime’ type shows up as “19-08-2020 un33fin33” or “19-08-2020 un44fin44”… after doctype is submitted.

Please suggest some ideas to resolve this.

check your Time Format in System setting, it should be filled and not blank