When I tried to pump it up, there was a small hole on the side wall close to the rim, but big enough that the tire would not properly inflate.
The Schwalbe Doc Blue sealant (which I think is made by Stans) did not seal, but made a mess in my garage.
I cannot recall that anything significant happened on my last ride 2 days ago that would've caused this. The hole is also not at a position where something easily cuts or slices into the tire.
The carbon rim does not show any signs of an impact, and during last Sunday's 110km ride everything was fine.
It looks like the hole is right at the end of one of the seams. In my eyes this looks like a faulty tire/ manufacturing issue. Have reached out to Schwalbe to assess it.
Besides that issue, both Schwalbe Pro Ones (28 mm in front, 30mm in rear) did not hold air well on the Roval CLX 50. Had to pump up before every ride.
Once they lost too much pressure, they became unseated quickly, i.e. collapsing from rim hook. Rim tape is okay, other tires did hold air properly on the CLX 50.
Roval CLX 50 and Schwalbe Pro One TLE is a no-no for me, and on top of that the disappointing Schwalbe quality... I am done with Schwalbe, never again.
Besides that: although the 30mm wide Schwalbe with sealant at lowish pressures feels comfortable, it also feels kinda sluggish when climbing and when accelerating out of the saddle... realized that today in direct comparison, since I had to put my lightweight wheels on w/ the 25mm Vittorias.


