2006 E320CDI Transmission shifting at much higher rpms under very light acceleration.

[EDBSO]

The car has been near perfect the last 8 years. The transmission now under very light acceleration shifts 1 to 2 at 2100rpm, 2 to 3 at 2300rpm and 3 to 4 at 2900rpm.
By briefly moving the shift lever to the right I can shift up earlier and into the high gears including 5th on the highway.

Transmission history:
Apr 2016 91,000km 56,875Miles Dropped the pan, cleaned, new filter and gasket used Shell 134 the approved fluid.
May 2018 138,700km 86,687miles removed drain plug and filled with Shell 134.
Aug 2023 203980km 127,487miles removed drain plug and filled with Shell 134.
The transmission color was and always is a bright fresh red.
March 4 2024 did the transmission plug and immediately upon the test drive the high shifting commenced. I noticed the plug was leaking when I changed the engine oil.
The highly reputable transmission shop feels that all the gears are there and that some unknown sensor is telling the transmission to hold the car in gear as though I am accelerating aggressively when actually I am using only the lightest of acceleration.
Only stored code is for abs and the abs works perfectly with no problems (likely set in winter with low battery voltage).
Current 218000km 136250miles.
Anyone experience this, ideas please.