Rear drum brake cylinder leak after push through

Finished doing a front brake job (pads and rotors) on my 2009 Prius, then noticed the backs were a little squeaky, so pulled the drums off and did a thorough cleaning (they were very dusty). I also pulled the components (brake pad brackets, star adjuster), particularly to clean the star adjusters. When reassembling the Drivers Rear drum, after finally getting the main spring (around the star adjuster) back on, I saw that I had inadvertently pushed the cylinder/piston all the way forward (though not enough for the end caps to come off). I re-centered the cylinder/piston and then pulled back the cylinder end covers to inspect and found fluid in the rear one. It dripped a tiny bit and I quickly put the end cap back on.
Note, I pulled the battery (-) and also the relays for all this.

Could I have permanently damaged the internal cylinder seals?
I plan to remove the rear end cap again and sop up/ remove any fluid in the cap, dry off, then reinstall. Then reassemble/put the drum back on and try pumping the brakes, then reinspect for fluid leaking.

I assume that if it leaks after testing, I need to replace the cylinder.
But if it doesn't continue leaking, am I good to go?
or perhaps do a bleed on that line to be sure no air got in?
Or do I need to replace that cylinder now either way?

It's a 2009, but only 85,000 miles, and as far as I know, these are the original rear drum brake cylinders.
Any advice would be welcome!
Thanks!