Thanks for @ssvenn great help.
Some further testing:
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Set safe mode then works fine.
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Edit app.yml to have Docker manager plugin only and rebuilt the app.
RESULT: works fine -
Edit app.yml to remove onebox plugin* only and rebuilt the app.
RESULT: works fine
*The only unofficial plugin I installed -
edit app.yml to have all plugins before modification and rebuilt the app.
RESULT: works fine
Well, finally this issue was gone. But I didn’t do anything, just rebuild the app again and again.
All apps building yesterday failed in category link.
All apps building this morning, Taiwan time, works fine on category link.
I think there are some updating code fix this issue during this period. But I still don’t know why.