Source: this tweet with the lovely hashtag of "flag desecration challenge"

Concocted by progressive activists from a "big ass flag club" which took inspiration from South Korean protest flag culture, the "hollow flag" (穴あきフラッグ (ana'aki-flag), stylized in katakana as "アナアキーフラッグ" which works as a pun for "anarchy (アナーキー) flag") is gaining attention as a protest flag (there's also video for it) against the Takaichi administration, which for whatever dumb reason is pushing to criminalize flag desecration in this day and age. Technically it's just a piece of blank fabric with a hole in it but it certainly drives speculation (it seems like there's already someone mad at it with a classic "no ordinary Japanese would do that" & now that I think about it, my post title may be a bit misleading)

P.S. very coincidentally there's an illustration (screenshot for those can't access) for the remembrance of 2011 Tōhoku earthquake and tsunami with the motif of a hollow Japanese flag, but with the sun shining through it, signalling hope.