hmm...
from the wiki:
Start dialog/dialog-layer
Starts dialog between the current character and a partner. The dialog has to be created under the dialog option of the addressed character. Following action parts will be executed immediately so take care if this is not the last action part of the listed actions.
If you read the quote I just added from the wiki then it says that any action parts listed after the start dialog will be executed immediately rather than waiting until after the dialog has ended.
So in other words the end cutscene action part you added is being voided pretty much straight away & I'm not sure it would work anyway? (I've not tested mind & if it does then... you should add the end cutscene action part to as an action to the dialog option that ends the dialog)
Always allow skip text is for allowing player to skip text during cut-scenes & even if the mouse has been disabled.