[Samsung Galaxy Tab S5e Guides, News, & Discussion] mrbonine:
I have the same experience. When I rebooted the last few times I forgot to hold the buttons and did a standard reboot to working system. After I realized my error, I checked to see if root had taken, since I wasn't getting blocked from file access in Fx and root was up and running, Since config issues may impact (I'm not using any add-ons to Magisk) do a reboot or two and verify root however you normally would.

If that works it would be cool if you queried on Magisk board to confirm what version the change was effective. Of course reporting back to this thread would help us all. Personally, after rooting S9, S10+, S20 X 2 (all Exynos when necessary) and this S5e Samsung has convinced me they mean business, I.e. Samsung will continue to throw $$ at this and they have more than all of us.

My uniformed guess is the amount of $$ and effort in chasing locked bootliaders on Qualcomm processor devices in the US suggests a reason: Qualcomm or Samsung are under injunction to do so. This is something they likely cannot disclose but may have happened in many scenarios, speculation is useless. Assuming injunction is US origin, it could apply to Qualcomm and woukd be stipulated by their contract with any manufacturer whose end product is sold in US. If Samsung, it's still a US injunction on them specifically. Other more unlikely scenarios would be restrictions on any system or bundled software that had a similar restriction and Samsung can't work around or replace (perhaps their UI layer or key part of their firmware).

Just screwing with the users and continuiung to lose knowledgeable customers isn't a good enough reason to keep writing code to prevent rooting, in my view. It would be much more efficient if they fear targeted exploits, for example, to provide unlock tokens at nominal cost, maybe $5 which would simply unlock the bootliader, the critical components like payments are already disabled by root, which to me is an easy trade-off. Should they issue tokens (one per device, not multiple) they would have a record along with a model/serial which is countable and referencible, if needed.

In that way they win with more information and support of influencers (ugh), much higher satisfaction and brand loyalty around here, and the substantial savings in cost could be used to oh let's see, put expandable storage back in flagships, even add the audio jack back in (no breath being held here).

Samsung is a leading memory card vendor, so they would get some of that back and I wouldn't feel so ripped of by my one lost wireless Samsung ear kernal. Even if they were free with purchase, after their service contract with Youbreakwefix or whatever their name is fell apart a lot of folks (me for one) didn't have access to authorized repair services for months. Vindication, no, but even though those buds/kernals/ear cave corns sound really great not worth retail. If Samsung could stop racing Apple to the bottom with taking away function because Apple did it would help differentiate the entire line.

These are simple issues to market around, for example the headphone jack: survey customers and publish the results. All mobile phone users, iPhone and Samsung specifically. State the COGs and how little space used, easily waterproofed etc. And throw in other Android benefits. As long as Samsung made the case of them Vs Apple, even a case about distributed supply lines as well other Android manufacturers would not be threatened.

Sorry for rant, and happy to trim this stuff out if inappropriate or offensive.

My perspective from Motorola Droid days using both Samsung S level and tablets AND iPhones and iPad Android is dramatically more easy to use, much less expensive, especially for apps, a more diverse and informed customer, and with Samsungs multiple lines especially, much lower entry cost and ongoing cost.