Unable to select parent task while converting task to subtask

[Qayyuum Harun]

I was unable to select the parent issue when converting from issue to sub task. I found out that there is an error logged in the console as the following:

[Max Haponenko]

Have same issue with next-gen cloud project.

[Fernando Bordallo]

Hello @Qayyuum Harun

Thank you for reporting this! May I ask, is this in a next-gen project or classic?

[Qayyuum Harun]

Sorry for the late reply. This is from classic project.