rrulestr don't get dtstart from différents rrules

[ArnaudBan]

I have a rruleSet that i save as a string in my database that look likes that :

DTSTART;TZID=Europe/Paris:20200909T075600
RRULE:FREQ=WEEKLY;BYDAY=TU;BYHOUR=11;BYMINUTE=15
DTSTART;TZID=Europe/Paris:20200907T075600
RRULE:FREQ=WEEKLY;BYDAY=TH;BYHOUR=11;BYMINUTE=15
DTSTART;TZID=Europe/Paris:20200901T075600
RRULE:FREQ=WEEKLY;BYDAY=WE;BYHOUR=9;BYMINUTE=20;UNTIL=20210415T072000

I try to get each of the rrules so a user can edit them. The probleme is i can't get the different dtstart from each rrules. Every rrules have the same drstart, witch is not the case in my database.

You can test my issue by doing the following :

const databaseRruleSetString = "DTSTART;TZID=Europe/Paris:20200909T075600
RRULE:FREQ=WEEKLY;BYDAY=TU;BYHOUR=11;BYMINUTE=15
DTSTART;TZID=Europe/Paris:20200907T075600
RRULE:FREQ=WEEKLY;BYDAY=TH;BYHOUR=11;BYMINUTE=15
DTSTART;TZID=Europe/Paris:20200901T075600
RRULE:FREQ=WEEKLY;BYDAY=WE;BYHOUR=9;BYMINUTE=20;UNTIL=20210415T072000"

const rruleSet = rrulestr(databaseRruleSetString)
const rruleSetString = rruleSet.toString()

rruleSetString is not the same as databaseRruleSetString every rrules has the same dtstart :

DTSTART;TZID=Europe/Paris:20200909T075600
RRULE:FREQ=WEEKLY;BYDAY=TU;BYHOUR=11;BYMINUTE=15
DTSTART;TZID=Europe/Paris:20200909T075600
RRULE:FREQ=WEEKLY;BYDAY=TH;BYHOUR=11;BYMINUTE=15
DTSTART;TZID=Europe/Paris:20200909T075600
RRULE:FREQ=WEEKLY;BYDAY=WE;BYHOUR=9;BYMINUTE=20;UNTIL=20210415T072000

I am using rrule version 2.6.8

Reporting an issue

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• [x] Verify that you've looked through existing issues for duplicates before creating a new one
• [x] Code sample reproducing the issue. Be sure to include all input values you are using such as the exact RRule string and dates.
• [x] Expected output
• [x] Actual output
• [x] The version of rrule you are using
• [x] Your operating system
• [x] Your local timezone (run $ date from the command line of the machine showing the bug)

[ephys]

I think your issue is the same as this one: https://github.com/jakubroztocil/rrule/issues/332