Underinflation can show those criss-cross pattern, this is normal, especially with latex inner tube being more supple.
You can still ride them, unless they look really bad like this;
It's a continuous line about 2mm thick around 3/4 of the tyre on one side, immediately under the green line that paves have. You can see the fabric underneath, but it doesn't look as bad as that one
@Bezzin started
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Underinflation can show those criss-cross pattern, this is normal, especially with latex inner tube being more supple.
You can still ride them, unless they look really bad like this;