buildifier sorts strings of lists inconsistently when a comment appears in the middle of the list

[mattnworb]

I noticed that a line with only a comment in it will break any sorting of AssignExprs when there is a comment before the assignment, but if the "keep sorted" comment is the first element in the list, then it will sort the list. Example:

list1 = [
    "foo",
    "bar",
    "buzz",
]

# buildifier: keep sorted
list2 = [
    "bar",
    "buzz",
    "foo",
]

# this will not be sorted:
# buildifier: keep sorted
list3 = [
    "foo",
    "bar",
    "buzz",
    # "blah",
    "abc123",
]

# this WILL be sorted:
list4 = [
    # buildifier: keep sorted
    "foo",
    "bar",
    "buzz",
    # "blah",
    "abc123",
]

buildifier will sort list4 but not list3:

❯ buildifier -mode=diff -lint=warn example.bzl
--- example.bzl	2026-02-05 16:06:51
+++ /var/folders/m1/5018nxw5655fd55ql3xqqpjm0000gn/T/buildifier-tmp-3189288486	2026-02-05 16:10:37
@@ -24,9 +24,9 @@
 # this WILL be sorted:
 list4 = [
     # buildifier: keep sorted
-    "foo",
     "bar",
     "buzz",
+    "foo",
     # "blah",
     "abc123",
 ]
exit status 1