Sequencer Playback Issue on Variant Activation in Unreal Engine: A Potential Bug?

Nice to meet you,

I am using variants in Unreal Engine to manage different states of a level. I want to call a specific function when a variant is activated. However, even if I write the playback process of the Sequencer in the function, there are times when the Sequencer does not play during the switch of variants.

It works after restarting. Is this a bug?
Thank you in advance.