When one brokerage buys another brokerage, how does Quicken handle your registers?

OK, I can see that I should have just changed the name and account numbers of the registers, but when Schwab bought TD Ameritrade, I had the Schwab account a long time before Schwab actually made the transfer.
Now months later, I discover that even though I mark the old closed account "keep separate from the other accounts" which I have done many times in the past, if I look at the investments pane of Quicken for Windows, the stocks involved are counted twice. Accordingly, I look doubly wealthy.
So I thought, well, it's a good solution to just transfer the stock from the old register to the new register. So now I have the correct number of stock shares in the new account.
Instead of having NO shares in the old account, I have NEGATIVE Shares in the old account. Even though I list that account as SEPARATED from other accounts, on the Investment Pane of Qkn4Win, I have fewer shares of said stocks. Doing ONE transfer seems to have wiped out the Positive shares leaving NEGATIVE shares in the old account. I swear that when I did the transfer, the action was indeed "TXFR", but when I go back to examine the problem, Quicken, not me, has changed the transaction to REMOVED. So no wonder I have negative shares.
In a matter of minutes, I have gone from doubly wealthy to doubly poor.
I solved this problem by literally obliterating the old file.
I realize that this problem is unique to me, as I have done something entirely idiotic, so ankle-biters need not apply. But if anyone else has had a similar experience, I would welcome hearing, in as much detail as you wish, what your experience was.
NEW TOPIC:
If Aravind Dakaraju, or anyone else at Quicken reads these community messages:
I would very much appreciate it if Quicken could concentrate on increasing the productivity [speed with accuracy] of Quicken Classic.
1- For example, less trash to remove from the memos. Many similar instances, but for example, if the action says DIV, there is no reason to fill the memo and the file with "DIVIDEND EARNED ON APPLE INC $ 0.250000/SHARE ON". Smaller files would enable keeping the data together for comparsion of multiple years before one is forced to create a new file.
2- Quicken gets slower and slower as the years pass. Every few years one is forced to create the registers in a new file to speed up the app. Software that creates a new file say on a chosen date with the needed starting points from the old data as of the chosen date would be a Wow event.
3- When Quicken gets very slow to accept new transactions, I would suspect that it is because Quicken writes nearly the entire file to hard drive after each transaction? Yes? No? Couldn't it be possible to store the last Gigabyte in a fast save file? I'm sure there is some reason.
No brick throwing please,
Thanks in Advance
Comments
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It sounds the holdings on the old account were removed twice. If that is the case, you could have deleted one set of Removed transactions.
I will hold of on throwing bricks, but your issue with slow performance will get more attention if you start a new discussion about that.
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