KMyMoney 5.2.0 - Currency conversion no longer possible when entering transactions?

I am using v5.2.0 built on Arch. In previous versions, I was able to specify the conversion rate when entering a transaction between accounts of different currencies. A window asking for the conversion rate no longer appears in v5.2.0. What is the new workflow?

When you enter the transaction in account denominated in currency A and select a category or account denominated in currency B then the currency symbol in the amount edit widget is enabled. Clicking on it switches between to the currency B and allows to modify the amount in that currency. Clicking again switches back to currency A.

No category selected or category with same currency selected, currency disabled
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Category or account with different currency selected, currency symbol enabled
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After click on the currency symbol
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