"the time limit will be 1-Hour and 20 minutes "

It seems to me that "time" has expired after the 1 + 20, so the "additional" inning should use the tie breaker rule, if needed.

No period there...

"the time limit will be 1-Hour and 20 minutes and finish the inning and then play one more complete inning, or half inning if the home team is ahead" THEN the period! ;)

What you have quoted would be a drop dead clock! ;)

I think y'all need to get the word "additional" out of your head. It is NOT an additional inning, it is the next inning, nothing more.

Piggyback thought; think "regulation".

A regulation game is when ......

A) 7 innings with a team ahead,
B) If tied after 7 innings, the tiebreaker rule applies,
C) A called game after 5 innings, etc.,
D) When a time limit has FULLY expired with a team ahead,
E) If tied after time limit has expired, the tiebreaker rule applies.

To be considered regulation as in "D", there must be one full regulation inning after 80 minutes. The inning AFTER THAT would be a tiebreaker inning, as in "E".

Using that word to be clear about which inning is meant, as it is identified in the book.

It seems to me the "time limit" has expired after the 1+20, rather then an inning later. The purpose of the tie breaker rule and the purpose of reducing the time limit by 20 minutes is to get a win/lose result expeditiously.

I don't see "fully" in the rule or any specific like the time limit has expired and the additional inning completed, although I wonder if "still tied" means that.

I guess I don't understand your confusion.

In the old rule, time expires after x-time, complete the inning.
In the new rule, time expires after x-time, complete the inning and the next.

Now, what happens if time expires at the exact instant the 3rd out is recorded? Do you play one inning or two? :D

One.

Under the old rule, the game is over, as there was no time left when the 3rd out was recorded. Under the new rule, we play one more.

OK, 1 second AFTER the 3rd out was recorded? ;)

2 more innings.
That's why "+ 1" inning rules are bad

No, that is not true and there is no problem with them.

There are no clarifications posted yet.
The rule literally says "tied after the time limit expires".
Does the sequence of sentences and the word "still" control the application of the rule?