I populated all the required fields as you can see below (no dynamic content, just text):

However, when I peek the code, the inputs are blank:

When I delete this action, the flow saves without any issues and runs well. However, when I add the Send Email action (V2) or even the send an email notification (V3), the above error shows up and there are no inputs.
I never ran into this issue before and need to use the Send Email action. My trigger is a "When an item is created or modified" and has a trigger condition in the Settings. Not sure if this is relevant, but it's the first time I implement this and the first time I run into this error as well.
Any tips would be welcome. Thank you!