diff --git a/ext/mbstring/libmbfl/filters/mbfilter_utf7imap.c b/ext/mbstring/libmbfl/filters/mbfilter_utf7imap.c
index 45722ce2c89..f3cbb87f2fd 100644
--- a/ext/mbstring/libmbfl/filters/mbfilter_utf7imap.c
+++ b/ext/mbstring/libmbfl/filters/mbfilter_utf7imap.c
@@ -147,6 +147,9 @@ int mbfl_filt_conv_utf7imap_wchar(int c, mbfl_convert_filter *filter)
 					 * or it could be that it ended on the first half of a surrogate pair */
 					filter->cache = filter->status = 0;
 					CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
+				} else {
+					/* Base64-encoded section properly terminated by - */
+					filter->cache = filter->status = 0;
 				}
 			} else { /* illegal character */
 				filter->cache = filter->status = 0;
diff --git a/ext/mbstring/tests/gh9535.phpt b/ext/mbstring/tests/gh9535.phpt
index f22a473561a..9b491673731 100644
--- a/ext/mbstring/tests/gh9535.phpt
+++ b/ext/mbstring/tests/gh9535.phpt
@@ -5,9 +5,6 @@ mbstring
 --FILE--
 <?php
 $encodings = [
-	'BASE64',
-	'HTML-ENTITIES',
-	'Quoted-Printable',
     'UTF-16',
     'UTF-16BE',
     'UTF-16LE',
@@ -58,6 +55,8 @@ echo PHP_EOL;
 
 $input = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';
 $bytes_length = 10;
+// For ISO-2022-KR, the initial escape sequence 'ESC $ ) C' will occupy 4 bytes of the output;
+// this will make mb_strcut only pick out 6 'A' characters from the input string and not 10
 foreach($encodings as $encoding) {
     $converted_str = mb_convert_encoding($input, $encoding, mb_internal_encoding());
     $cut_str = mb_strcut($converted_str, 0, $bytes_length, $encoding);
@@ -69,24 +68,22 @@ echo PHP_EOL;
 
 $input = '???';
 $bytes_length = 2;
+// ISO-2022-KR will be affected by the initial escape sequence as stated above
 foreach($encodings as $encoding) {
     $converted_str = mb_convert_encoding($input, $encoding, mb_internal_encoding());
     $cut_str = mb_strcut($converted_str, 0, $bytes_length, $encoding);
     $reconverted_str = mb_convert_encoding($cut_str, mb_internal_encoding(), $encoding);
-    echo $encoding.': '.$reconverted_str.PHP_EOL;
+    echo $encoding.trim(': '.$reconverted_str).PHP_EOL;
 }
 
 echo PHP_EOL;
 
 foreach($encodings as $encoding) {
-    var_dump(mb_strcut($input, 0, $bytes_length, $encoding));
+    echo $encoding.trim(': '.mb_strcut($input, 0, $bytes_length, $encoding)).PHP_EOL;
 }
 
 ?>
---EXPECTF--
-BASE64: 宛如繁
-HTML-ENTITIES: 宛&#22914
-Quoted-Printable: %s
+--EXPECT--
 UTF-16: 宛如繁星般宛如
 UTF-16BE: 宛如繁星般宛如
 UTF-16LE: 宛如繁星般宛如
@@ -101,9 +98,6 @@ CP50220: 宛如繁星
 CP50221: 宛如繁星
 CP50222: 宛如繁星
 
-BASE64: 星のように
-HTML-ENTITIES: 星の&#12
-Quoted-Printable: 星の
 UTF-16: 星のように月のように
 UTF-16BE: 星のように月のように
 UTF-16LE: 星のように月のように
@@ -118,9 +112,6 @@ CP50220: 星のように月の
 CP50221: 星のように月の
 CP50222: 星のように月の
 
-BASE64: %s
-HTML-ENTITIES: あa&
-Quoted-Printable: あa
 UTF-16: あaいb
 UTF-16BE: あaいb
 UTF-16LE: あaいb
@@ -135,9 +126,6 @@ CP50220: あa
 CP50221: あa
 CP50222: あa
 
-BASE64: AAAAAA
-HTML-ENTITIES: AAAAAAAAAA
-Quoted-Printable: AAAAAAAAAA
 UTF-16: AAAAA
 UTF-16BE: AAAAA
 UTF-16LE: AAAAA
@@ -146,15 +134,12 @@ UTF7-IMAP: AAAAAAAAAA
 ISO-2022-JP-MS: AAAAAAAAAA
 GB18030: AAAAAAAAAA
 HZ: AAAAAAAAAA
-ISO-2022-KR: AAAAAAAAAA
+ISO-2022-KR: AAAAAA
 ISO-2022-JP-MOBILE#KDDI: AAAAAAAAAA
 CP50220: AAAAAAAAAA
 CP50221: AAAAAAAAAA
 CP50222: AAAAAAAAAA
 
-BASE64:%s
-HTML-ENTITIES: ??
-Quoted-Printable: ??
 UTF-16: ?
 UTF-16BE: ?
 UTF-16LE: ?
@@ -163,25 +148,22 @@ UTF7-IMAP: ??
 ISO-2022-JP-MS: ??
 GB18030: ??
 HZ: ??
-ISO-2022-KR: ??
+ISO-2022-KR:
 ISO-2022-JP-MOBILE#KDDI: ??
 CP50220: ??
 CP50221: ??
 CP50222: ??
 
-string(0) ""
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
-string(2) "??"
+UTF-16: ??
+UTF-16BE: ??
+UTF-16LE: ??
+UTF-7: ??
+UTF7-IMAP: ??
+ISO-2022-JP-MS: ??
+GB18030: ??
+HZ: ??
+ISO-2022-KR:
+ISO-2022-JP-MOBILE#KDDI: ??
+CP50220: ??
+CP50221: ??
+CP50222: ??