In the End, endermen are spawning regardless of light level, and they are spawning on top of stained glass blocks. I've tested this by completely covering everything in the End (the main island where the dragon spawns) with water - after the dragon is dead. Endermen will still spawn on stained glass blocks that I place down, regardless of how well lit the area is. They are also spawning on top of the bedrock (fountain and blocks on top of the obsidian pillars) if I don't cover their surface with bottom-placed slabs or water.
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I've noticed in this version mobs spawn on everything except bottom slabs even glass and carpet.

I've noticed in this version mobs spawn on everything except bottom slabs even glass and carpet.

I've noticed in this version mobs spawn on everything except bottom slabs even glass and carpet.

I've noticed in this version mobs spawn on everything except bottom slabs even glass and carpet.

Yes, there are no caves that aren't filled with water. The mobs are definitely spawning directly on the glass. I have also made a huge area made-up of bottom slabs. The endermen do NOT spawn there ... they will teleport there only after spawning on the glass blocks. Usually the endermen spawn only one at a time, but I have seen up to 4 spawn simultaneously on the same glass block, only to spread out or teleport to slabs after spawning.

Yes, there are no caves that aren't filled with water. The mobs are definitely spawning directly on the glass. I have also made a huge area made-up of bottom slabs. The endermen do NOT spawn there ... they will teleport there only after spawning on the glass blocks. Usually the endermen spawn only one at a time, but I have seen up to 4 spawn simultaneously on the same glass block, only to spread out or teleport to slabs after spawning.

Yes, there are no caves that aren't filled with water. The mobs are definitely spawning directly on the glass. I have also made a huge area made-up of bottom slabs. The endermen do NOT spawn there ... they will teleport there only after spawning on the glass blocks. Usually the endermen spawn only one at a time, but I have seen up to 4 spawn simultaneously on the same glass block, only to spread out or teleport to slabs after spawning.

Yes, there are no caves that aren't filled with water. The mobs are definitely spawning directly on the glass. I have also made a huge area made-up of bottom slabs. The endermen do NOT spawn there ... they will teleport there only after spawning on the glass blocks. Usually the endermen spawn only one at a time, but I have seen up to 4 spawn simultaneously on the same glass block, only to spread out or teleport to slabs after spawning.

Are you sure you see this issue on 1.2.5.12 (beta) or 1.2.5.15 (beta)? As those versions should have fixed the mobs spawning on glass issue. It does happen in 1.2.3 (not beta).
https://feedback.minecraft.net/knowledgebase/articles/1816993-minecraft-xbox-one-win-10-android-beta-1-2-5-bui - Hostile mobs will no longer spawn on top or inside transparent blocks
Possibly you have selected the wrong version to be affected.

Ah, I have different versions on my devices. This one IS running 1.2.3!

Ah, I have different versions on my devices. This one IS running 1.2.3!

Ah, I have different versions on my devices. This one IS running 1.2.3!

Ah, I have different versions on my devices. This one IS running 1.2.3!

Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-14467.
It has been linked to this report.
Please search before reporting, as it's likely that one exists already.
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Side Note
The mentioned enderman spawning in lit area has been documented/reported as a separate issue: MCPE-28627
Are you sure there isn't a cave where the enderman spawn and then teleport to those blocks? Enderman teleporting has different rules then spawning. I don't see this issue if every possible spawn is blocked in version 1.2.5.