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.psd files can be overwritten via "Save all all images" into lossy JPEG, resulting in irreversable loss of alpha channel and all the layer data!
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System Information
Operating system: Windows-10-10.0.14393 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67

Blender Version
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-17 21:07, hash: rB741641f4c3b8
Worked: 2.79

Short description of error
Ok this one is pretty serious issue, I almost lost a big chunk of my assets because blender can apparently overwrite .psd files if you accidentally edit something and then press "Save all modified images"
It results in complete loss of all the layer and alpha data inside the PSD file.
Here a video demonstrating what happens:

Plus, on top of that there even appears to be a giant loss of data via compression too, so its impossible to salvage the file after it gets overwritten

Please address this issue before more people irreversibly lose their data!

Exact steps for others to reproduce the error
-Import any kind of .psd image into blender
-Create any kind of edit via Texture Paint mode
-Save all modified images