«Reformat on paste» is set to «None», but IntelliJ IDEA ignores it when a code is pasted to a PHPDoc comment block.
A workaround is to paste using CTRL + ALT + SHIFT + V («Edit» → «Paste» → «Paste as Plain Text»):
intellij-support.jetbrains.com/hc/en-us/community/posts/207280009/comments/207437845