declare(1) not executing inside source'd script

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Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-redhat-linux-gnu' 
-DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  -D_GNU_SOURCE -DRECYCLES_PIDS 
-DDEFAULT_PATH_VALUE='/usr/local/bin:/usr/bin'  -O2 -g -pipe -Wall 
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong 
--param=ssp-buffer-size=4 -grecord-gcc-switches 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  -m64 -mtune=generic 
-Wno-parentheses -Wno-format-security
uname output: Linux student.eeconsulting.net 3.10.0-693.11.6.el7.x86_64 #1 SMP 
Thu Jan 4 01:06:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-redhat-linux-gnu

Bash Version: 4.4
Patch Level: 23
Release Status: release

Description:
        A script contains a function definition followed by
            declare -fx funcname
        but the declare(1) doesn't execute and the function
        is not exported after source'ing the file.  In addition,
        executing 'declare -p -F | grep "funcname"' does not
        produce any output (making me think that declare(1)
        isn't being executed at all).

Repeat-By:
        $ cat <<__EOF__ >/tmp/bashbug.bash
        > function myfunc {
        >     echo "Running..."
        > }
        > declare -fx myfunc
        > declare -p -F | grep "myfunc"
        > __EOF__
        $ source /tmp/bashbug.bash

        The function is now defined, but is not exported.
        And the output of the last command never appears,
        but if the same command is executed now -- at
        the interactive shell prompt -- it does show that
        'myfunc' is defined.

Fix:
        Strangely, if I create another script that sources
        the first one, then execute the declare commands in
        that second script, everything works when I source
        the second file?!