[BUG] invalid-shift-base umaskcmd() src/miscbltin.c:258:26

I encountered a bug in Dash 0.5.13 and would like to report
it. The details are  provided below.
# # miscbltin.c:258:26: runtime error: left shift of 1073741823 by 3
places cannot be represented in type 'int'
    #0 0x65484e899f22 in umaskcmd /upstream/z/dash-0.5.13/src/miscbltin.c:258:26
    #1 0x65484e872c55 in evalbltin /upstream/z/dash-0.5.13/src/eval.c:975:12
    #2 0x65484e86dec4 in evalcommand /upstream/z/dash-0.5.13/src/eval.c:923:7
    #3 0x65484e86b07c in evaltree /upstream/z/dash-0.5.13/src/eval.c:305:12
    #4 0x65484e8971ac in cmdloop /upstream/z/dash-0.5.13/src/main.c:247:8
    #5 0x65484e896e6e in main /upstream/z/dash-0.5.13/src/main.c:181:3
    #6 0x746fa5d61249 in __libc_start_call_main
csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #7 0x746fa5d61304 in __libc_start_main csu/../csu/libc-start.c:360:3
    #8 0x65484e839930 in _start
(/upstream/zz/dash-0.5.13/src/dash+0x42930) (BuildId:
f5787a810ed7cf088639c548c8ff13ea66dcb3e3)

SUMMARY: UndefinedBehaviorSanitizer: invalid-shift-base miscbltin.c:258:26

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My environment:
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Debian-12, x86-64, clang-19 compiler

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Steps to reproduce:
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$ aclocal && autoheader && automake --add-missing && autoconf
$ CC=clang CFLAGS=" -Wno-everything -fsanitize=undefined -g -O0"
./configure --disable-fnmatch --disable-lineno --disable-glob
$ make
$ cd src
$ export UBSAN_OPTIONS=print_stacktrace=true,symbolize=true,print_stacktrace=1,report_error_type=1,symbolize=1
$ ./dash < myfile.txt

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Steps to get myfile.txt:
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copy the text into file bs64.txt (between ==== and ======):
=====================================================================================
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=====================================================================================