For a while, my email server uses 1024-bit DKIM, but i want a longer key, 2048-bit. So i reinstall my server with 2048-bit key when configuring OpenDKIM, but i’m having quirks when pasting the key in desec. In mobile UI, the key was split into multiple separate values which i don’t want. So i select each of the splitted key, cut it, delete the empty value, and put them back on one, single TXT value. Luckily after all that, the new DKIM key is valid. Wish this issue was fixed, but good thing i figured this out myself 
Not really an issue. You still get a single TXT record even if long values are broken up into 255 byte segments.
See RFC 6763 section 6.1.
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