We've created several new droplets using photoshop cc 2018 on different macs and haven't seen any major new issues related to photoshop cc 2018, so far.
If your able to post a screenshot of the action and Create Droplet settings that would be very helpful in determining the problem.
I've had some weird issues with droplets lately so I tested this. I made an action in PS 2017 and saved it as a droplet. I made the same action in PS 2018 and created an identical droplet. Both droplets work identically using PS 2018. If I have PS 2017 (2015.5) open and use the droplet created in PS 2018, it works and runs correctly in PS 2017. Just thought I'd let you know another user tried to reproduce this and couldn't.
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In your action Save As step is set to save as a psd file.
If you want to change to another format, it's probably best to delete the save as step and record it again using the different file format.
Anytime you have a save as step in an action and specify a different destination folder in the create droplet settings other than the action save as you need to check Override action"Save As" commands which still saves as the recorded format (psd in your action), but saves to the destination folder specified in the create droplet settings instead of the action save as step.
Oh the Save as PSD was wrong cause I hastily reproduced the action.
The problem was the Override Action.. quite embarrissing after creating dozens of droplets.
Sorry guys and thanks for clearing my mind.