[FS#3809] v21.02.0-rc1 reports false missing "which"

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FS#3809 - v21.02.0-rc1 reports false missing "which" 
User who did this - plntyk (plntyk)

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further investigated this

Fedora 30: OK
Fedora 31: OK
Fedora 32: OK
Fedora 33: OK
Fedora 34-LiveCD: OK
Fedora 34 (installed & updated: FAIL

Package 
which 2.24-24 is ok (vanilla live iso: Fedora-Workstation-Live-x86_64-34-1.2.iso=
which 2.24-26 fails (updating live iso , open new bash to enable new environment then fails)

fails (which 2.24-26):
env |grep -i which
which_declare=declare -f
BASH_FUNC_which%%=() {  ( alias;
 eval ${which_declare} ) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "$@"

works (2.24-24)
env |grep -i which
BASH_FUNC_which%%=() {  ( alias;
 eval ${_declare} ) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "$@"


maybe file a bug against Fedora ? (bugzilla.redhat.com)

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3809#comment9721

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