Do Symbols with inconsistent bar-ryhtms exist? (Like different Trading-Sessions by weekday (or within the week))

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We have Symbols like the S&P500 opening between 09:30 and 16:30, Mon-Fri.                                    -> The Bar Rythm stays constant, because the bar rythm restarts every weekday at 9:30.
We have Symbols like the EURUSD (usually) trading non-stop from monday morning till Friday night.  -> The Bar Rythm stays constant, because it has only 1 starting point (monday).

But can anyone, name symbols (dont matter if exotic) with an inconsistent bar-rythm? (== same time-frame bars having a different timestamp position on a different weekday, than the day before)

like this: (differing-schedule-start -> 2H or 4H Bar inconsistency)
Monday               9:00 - 18:00
Tuesday             10:00 - 18:00
Wed, Thu, Fri      9:00 - 18:00

or like this: (schedule-pattern interrupted by another session-pattern -> 2H or 4H Bar inconsistency (on wednesday))

Monday         9:00 - 18:00
Tuesday         9:00 - Wednesday 18:00 
Thu, Fri         9:00 - 18:00

or (2 different session-patterns  -> example:1H or 4H Bar inconsistency)

Monday 9:00 - Wednesday 18:00
Friday   3:10  -    Saturday 23:00 

 
Baynez:

We have Symbols like the S&P500 opening between 09:30 and 16:30, Mon-Fri.                                    -> The Bar Rythm stays constant, because the bar rythm restarts every weekday at 9:30.
We have Symbols like the EURUSD (usually) trading non-stop from monday morning till Friday night.  -> The Bar Rythm stays constant, because it has only 1 starting point (monday).

But can anyone, name symbols (dont matter if exotic) with an inconsistent bar-rythm? (== same time-frame bars having a different timestamp position on a different weekday, than the day before)

like this: (differing-schedule-start -> 2H or 4H Bar inconsistency)
Monday               9:00 - 18:00
Tuesday             10:00 - 18:00
Wed, Thu, Fri      9:00 - 18:00

or like this: (schedule-pattern interrupted by another session-pattern -> 2H or 4H Bar inconsistency (on wednesday))

Monday         9:00 - 18:00
Tuesday         9:00 - Wednesday 18:00 
Thu, Fri         9:00 - 18:00

or (2 different session-patterns  -> example:1H or 4H Bar inconsistency)

Monday 9:00 - Wednesday 18:00
Friday   3:10  -    Saturday 23:00 

You could discover it with code but it could be missing ticks not sessions per se . What is the use of that btw if you don't mind 

 
It depends on the type of instrument and level of liquidity in that market. If there is low liquidity in a market, it will show an inconsistent trend, this is why people want to trade symbols of high daily percentage change. Commodities have been known to be a lot more inconsistent than indices or currency pairs
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