This is a user-to-user technical community. Contributors here are all end-users, just like you. Beyond information publicly released information, nobody here can offer any definitive insight as to Apple's intentions concerning bug fixes, software development or release program.
Be aware that other than the site Moderators, Apple neither monitors nor participates within this Community. As such, your comments here will not be seen by Apple Support or its Developers.
Once you have upgraded your iPad to iPadOS 26, you cannot now roll-back to iPadOS 18.x.
If you have a consistent and repeatable issue - you should submit a Bug Report via Apple's Product Feedback portal:
Feedback - Apple
When submitting a Bug Report, please ensure that you include details of your iPad model and installed version of iPadOS within the body-text of your report along with details of the problem. Do not rely upon the pick-list - as this rarely includes the current version of iPadOS.
Every Bug Report counts. Unless reports are submitted (with adequate detail), Apple may not assign resources to investigate and correct the issue.
In addition [i.e., not as a substitute] to submitting a Bug Report, you might also consider seeking assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page; you can initiate and manage your support cases from Apple devices using the excellent Apple Support App. If not already installed, the App can be downloaded from the App Store:
https://apps.apple.com/app/apple-support/id1130498044