SurvivalFly false positive swimming in water

[deka9584]

Short description of the issue.

Running a Spigot 1.12.2 server with ViaVersion and using 1.13+ client, swimming in water will result a false positive SurvivalFly check.

Complete output of the ncp version command (please prefer text here).

╗Version information½
Server:
git-Spigot-79a30d7-f4830a1 MC: 1.12.2
Detected: 1.12.2
NoCheatPlus:
Plugin: 3.17.1-SNAPSHOT-Updated-b167
MCAccess: 1.12-1.12.2 / Spigot-CB-1.12_R1
Features:
blocks: BlocksMC1_4, BlocksMC1_5, BlocksMC1_6_1, BlocksMC1_7_2, BlocksMC1_8, BlocksMC1_9, BlocksMC1_10, BlocksMC1_11, BlocksMC1_12
checks: FastConsume, Gutenberg, HotFixFallingBlockPortalEnter
defaults: pvpKnockBackVelocity
Hooks:
AllViolationsNCP 1.0, ViolationFrequencyNCP 1.0
╗Related Plugins½
ViaVersion v4.7.0

How to reproduce the issue (is it random / always happens / side conditions)?

1. Download Spigot 1.12.2
2. Install ViaVersion and NoCheatPlus
3. Join with a 1.13 or newer client
4. Try to swim in water

After about 5 seconds you will start to get flown back and as you keep trying the failed survival fly log will appear.

Have you made any (noteworthy) changes to the default configuration of NCP?

No, the problem also occurs with the original configuration.

Do you run any other special plugins that affect game mechanics next to NC+ (adding skills, machines, adding/changing blocks, other anti cheating)?

No, only NCP and ViaVersion.

Provide additional information, such as error/debug/violation logs. (For reproducible issues with moving consider: https://github.com/NoCheatPlus/Docs/wiki/Debugging#on-the-fly-debug-output-for-individual-players) Use GitHub gists or http://pastebin.com/ or similar for huge logs, or attach a (zip-) file here. For image uploads, please prefer a site that allows viewing without JavaScript, you can upload file attachments for issues right here.