[Huawei P Smart ROMs, Kernels, Recoveries, & Other ] Livi-Tech:
Good news

I managed to see this issue for myself

I spent 4 hours looking into this 2 days ago and not having this file issue, after research I found out it happens when encryption is turned on and different software is flashed, I thought you may have turned it on but after finding out you did not, I looked into it further yesterday, and noticed in my settings the encrypt phone option didn't work, after doing further research, I found out Huawei Phone's have encryption turned on by default and it can not be turned off through the settings.

Obviously I got confused as to why my phone was not encrypted and why the encrypt option 1) did not work 2) was even there as it wasn't supposed to be, luckily I remembered all boot files on new phones have an encryption flag and my boot file was modified by the magisk installer which disables it, my boot file being modified is 1) why I had an encrypt phone option that was not supposed to be there 2) why I struggled to have your issue with the files changing into numbers and letters.

My results using the default EMUI boot file

I did a format data ( format data will wipe everything ) then flashed EMUI Pixelized with the default boot file and my files were okay but after going back into TWRP, doing a factory reset ( will remove most folders but not all ) and reflashing the exact same version of EMUI Pixelized my folders became numbers and letters.

My results with a modified EMUI boot file

I did a format data ( format data will wipe everything ) then flashed EMUI Pixelized with the modified boot file and my files were okay and after going back into TWRP, doing a factory reset ( will remove most folders but not all ) and reflashing the exact same version of EMUI Pixelized my folders were still okay.

Conclusion

I suspect the reason your files are changing into numbers and letters is because you are using the default boot file.

The default boot file has an encryption flag that is enabled, which means everytime you switch software without doing a full format, your files will become numbers and letters (due to previous encryption done by the boot file).

this is also the reason me and my friends struggled to get the issue, we struggled to get this issue because our boot files have encryption turned off (if you use magisk, the installer disables the encryption flag) and EMUI Pixelized does not change or touch the boot file in any way so with encryption turned off, we were able to swtich to different software's without issues and without our files and folders changing into numbers and letters.

Solution

I'm creating a new EMUI 1.0 version that will flash the latest boot file that has been modified to have encryption disabled as there is a high chance that unless someone is using a magisk modified boot file they will experience the same issue.

In the mean time do this in order:

Download and copy this zip file to your phone or external sd card - Disable encryption

Flash the file through twrp

Do format data - not factory reset

type in yes to confirm

Install EMUI Pixelized 1.0

If you want to test to make sure it works, you could reboot into TWRP, do a factory reset, flash EMUI Pixelized 1.0 again and see if any of your folders change into numbers and letters again.