Going to try and share specific details as much as I can; I do some level of software engineering as a hobby and I know it's important to do so.

Program Version:

Downloaded client from Minecraft.net.

Basically it's the Linux version of Minecraft.

Program Settings:

Hard difficulty.

Minimum visual specs in most cases. No fancy lighting or clouds, running at minimum possible graphical settings; favoring performance.

Expected Result:

Warden loses "sight" of player when player is far above ground or out of normal "sight" range, which is believed to be 16 blocks radius.

Actual Result:

Warden "tracks" player far out of normal range. May or may not be able to attack from very far away.

Situation:

Summoned a Warden under normal conditions. Cleared a lot of Sculk, too close to sensor/spawn area, Warden appeared. Warden wandered far away from Sculk area and started drifting through lava lake.

When the Warden tracked me (the player) towards the nearest exit, I was destroyed by a Warden's attack. At the time I was behind an artificially built wall in such a way that might allow me to return to the area and run away before the Warden noticed again.

Warden remained active. Most likely normal? What was not normal was the resulting situation.

Warden tracking was EXTREME. Warden kept spotting player character with range as far as positive Y of 60 or more. Warden initiated threat behavior despite player not being anywhere in reasonable range. Behavior was similar at Y: 16-ish but somewhat more believable. However, Warden is still as far down as Y: -50 or more.

Unsure if Warden was able to attack from extreme range.

Final screenshot is from home base, which is easily Y: 40+ or so.