diff --git a/chat/message.go b/chat/message.go
index 78abd30..6a4061e 100644
--- a/chat/message.go
+++ b/chat/message.go
@@ -51,7 +51,7 @@ const (
 
 // Message is a message sent by other
 type Message struct {
-	Text string `json:"text" nbt:"text"`
+	Text string `json:"text" nbt:"text,omitempty"`
 
 	Bold          bool `json:"bold,omitempty" nbt:"bold,omitempty"`                   // 粗体
 	Italic        bool `json:"italic,omitempty" nbt:"italic,omitempty"`               // 斜体
diff --git a/level/bitstorage.go b/level/bitstorage.go
index 715ad04..be6e644 100644
--- a/level/bitstorage.go
+++ b/level/bitstorage.go
@@ -153,17 +153,7 @@ func (b *BitStorage) Raw() []uint64 {
 	return b.data
 }
 
-func (b *BitStorage) ReadFrom(r io.Reader) (int64, error) {
-	var Len pk.VarInt
-	n, err := Len.ReadFrom(r)
-	if err != nil {
-		return n, err
-	}
-	if cap(b.data) >= int(Len) {
-		b.data = b.data[:Len]
-	} else {
-		b.data = make([]uint64, Len)
-	}
+func (b *BitStorage) ReadFrom(r io.Reader) (n int64, err error) {
 	var v pk.Long
 	for i := range b.data {
 		nn, err := v.ReadFrom(r)
@@ -213,3 +203,19 @@ func (b *BitStorage) Fix(bits int) error {
 	}
 	return nil
 }
+
+func (b *BitStorage) Expand(bits int) error {
+	if bits == 0 {
+		b.mask = 0
+		b.bits = 0
+		b.valuesPerLong = 0
+		return nil
+	}
+	b.mask = 1<<bits - 1
+	b.bits = bits
+	b.valuesPerLong = 64 / bits
+	// check data length
+	dataLen := calcBitStorageSize(bits, b.length)
+	b.data = make([]uint64, dataLen)
+	return nil
+}
diff --git a/level/palette.go b/level/palette.go
index e68a047..e172fed 100644
--- a/level/palette.go
+++ b/level/palette.go
@@ -142,12 +142,14 @@ func (p *PaletteContainer[T]) ReadFrom(r io.Reader) (n int64, err error) {
 		return n, err
 	}
 
+	p.data = NewBitStorage(p.bits, p.data.length, nil)
+
 	nn, err = p.data.ReadFrom(r)
 	n += nn
 	if err != nil {
 		return n, err
 	}
-	return n, p.data.Fix(p.bits)
+	return n, nil
 }
 
 func (p *PaletteContainer[T]) WriteTo(w io.Writer) (n int64, err error) {