mount roulette underwater bug

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Date & Time: October 7, 2019, 9:55pm PDT
Frequency: always
World name: Twintania
Character name: Starvald Demelain
Retainer name: NA
NPC name: NA
Monster name:NA
Class/Level: FSH
Party or solo: solo
In-game time: 2:11am
Area and coordinates: Ruby Sea, everywhere but currently at 3.9,35.7.,-9.0
Housing: NA
Steps:
1. dive underwater in Ruby Sea
2. try to call mount via mount roulette button
3. button is greyed out and mount cannot be called
4. try calling specific mount via their dedicated button works though
*Add more steps if necessary

Connection Specs
- Type of internet connection/provider:
- Modem maker/model number:

■ PS4 Specs

Model Number of the PlayStation®4 You Are Using
- Model Number: PS4Pro CUH-7015B


Information About the Peripherals You Are Using
-Type: wireless Controller
-Maker: Sony
-Model Number:CUH-ZCT2U

Are you using Mount Roulette, or Flying Mount Roulette? If former, likely by design, to prevent the game from attempting to summon a mount that can't swim (or fly, really).

Actually. Wait. 5.0 notes said all mounts can now fly. So. Likely the previous explanation was the original intent. But now, Flying Mount Roulette could/should be removed entirely, as both roulettes should now function the same. And, obviously, while they're at it, should ensure Mount Roulette works in situations like this.