Adding a taskflow from composer goes to a blank page

If this happens to you, you're probably using a custom catalog on PS4 (this bug will be fixed in PS5).
This happens because when you create a custom catalog, spaces somehow eats some of the single quotes in taskflow definitions.

In the meantime here are simple steps to fix this issue:
Get the code for the custom catalog, then copy it into a notepad, then performed a replace all on:
#{uib_o_w_s_r_DefaultGroupSpaceCatalog[
replaced with
#{uib_o_w_s_r_DefaultGroupSpaceCatalog['

then to adjust for those entries which already had the quote, another replace all:
#{uib_o_w_s_r_DefaultGroupSpaceCatalog[''
replaced with
#{uib_o_w_s_r_DefaultGroupSpaceCatalog['

Try to add your taskflow again and it should now work normally.