JDK may have wrong DST rules for Europe/Dublin and Africa/Casablanca.
Reading through the timezone data (europe and africa), the DST in Europe/Dublin from 1968/10/27 to 1971/10/31 is not observed. However, the JDK returns the results as Dublin has DST during this period.

# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
Rule Eire 1971 only - Oct 31 2:00u -1:00 -
Rule Eire 1972 1980 - Mar Sun>=16 2:00u 0 -
Rule Eire 1972 1980 - Oct Sun>=23 2:00u -1:00 -
Rule Eire 1981 max - Mar lastSun 1:00u 0 -
Rule Eire 1981 1989 - Oct Sun>=23 1:00u -1:00 -
Rule Eire 1990 1995 - Oct Sun>=22 1:00u -1:00 -
Rule Eire 1996 max - Oct lastSun 1:00u -1:00 -

# Zone NAME STDOFF RULES FORMAT [UNTIL]
#STDOFF -0:25:21.1
Zone Europe/Dublin -0:25:21 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00s
-0:25:21 1:00 IST 1916 Oct 1 2:00s
0:00 GB-Eire %s 1921 Dec 6 # independence
0:00 GB-Eire GMT/IST 1940 Feb 25 2:00s
0:00 1:00 IST 1946 Oct 6 2:00s
0:00 - GMT 1947 Mar 16 2:00s
0:00 1:00 IST 1947 Nov 2 2:00s
0:00 - GMT 1948 Apr 18 2:00s
0:00 GB-Eire GMT/IST 1968 Oct 27
# Vanguard section, for zic and other parsers that support negative DST.
1:00 Eire IST/GMT
# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
# 1:00 - IST 1971 Oct 31 2:00u
# 0:00 GB-Eire GMT/IST 1996
# 0:00 EU GMT/IST
# End of rearguard section.

jshell> ZoneId DUBLIN = ZoneId.of("Europe/Dublin")
jshell> Instant i1 = Instant.from(ZonedDateTime.of(LocalDate.of(1970, 6, 23), LocalTime.MIN, DUBLIN))
jshell> Instant i2 = Instant.from(ZonedDateTime.of(LocalDate.of(1971, 6, 23), LocalTime.MIN, DUBLIN))
jshell> DUBLIN.getRules().getOffset(i1)
$21 ==> +01:00
jshell> DUBLIN.getRules().getStandardOffset(i1)
$22 ==> Z
jshell> DUBLIN.getRules().getOffset(i2)
$23 ==> +01:00
jshell> DUBLIN.getRules().getStandardOffset(i2)
$23 ==> Z

In Africa/Casablanca, the offset between 2038/9/26 and 2038/11/6 should be GMT-1. However the JDK returns the results as no DST defined during this period.

Rule Morocco 2038 only - Sep 26 3:00 -1:00 -
Rule Morocco 2038 only - Nov 7 2:00 0 -

jshell> ZoneId CASABLANCA = ZoneId.of("Africa/Casablanca")
jshell> Instant i3 = Instant.from(ZonedDateTime.of(LocalDate.of(2038, 11, 1), LocalTime.MIN, CASABLANCA))
jshell> CASABLANCA.getRules().getOffset(i3)
$26 ==> Z
jshell> CASABLANCA.getRules().getStandardOffset(i3)
$27 ==> Z