There is one for the Oneplus 7t and 7t pro aswell, you can check it out Here
Must have Magisk Installed
Flash .zip via Magisk v17.0+ (Open Magisk>Select Modules from the Side Panel> Press the + button>choose the zip that you downloaded)
If you want to return to stock boot animation, disable/ remove module via magisk and reboot
Oneplus 7: Link
Oneplus 7 pro: Link
- If you do not see the bootanimation or you see the stock boot animation, check if you have any other magisk bootanimations actiavated?
If you do, disable them all, reboot, and reflash.
- If that does not work work: Last resort, you can move the bootanimation.zip (located in the magisk module zip: system/media folder) manually to /system/media on your phone and set permissions to rw-r-r
If you end up using this method, remember to back up stock bootanimation by adding a .bak at the end of the file name.